Synthesis and characterization of 4-[(E)-(-2,5- dimethoxybenzylidene)amino] benzoic acid Schiff base and evaluation as corrosion inhibitor of steel in 2.0 M H2SO4.

Journal of Applied Sciences and Environmental Management

ECHEM, OGBONDA G¹  ABOSEDE, JAMES¹  OFORKA, NC¹ 

关键词: Schiff base;    corrosion;    chemisorption;    weight loss and gasometric technique;   

DOI  :  

学科分类：环境科学（综合）

来源: University of Port Harcourt * Department of Pure and Industrial Chemistry

【 摘 要 】

The synthesis of 4-[(E)-(-2,5- dimethoxybenzylidene)amino] benzoic acidSchiff base, SBDAB was carried out inorder to determine its inhibitory efficiency at highertemperature using weight loss and gasometric techniques. The results showed that theinhibition efficiency of the studied Schiff base increased with increase in temperature for thecorrosion of mild steel which suggests chemisorption reaction mechanism. The negative freeenergy of adsorption obtained confirms a spontaneous adsorption of the Schiff base on themetal surface. The positive values of the heat of adsorption suggest an endothermic reaction.The positive values of the entropy of adsorption suggest a disordered system. The Langmuiradsorption Isotherm result showed a deviation from an ideal Langmuir adsorption isothermequation, this is due to the interaction of the inhibitor molecules with one another. Theinhibition efficiency of 35.20% and 35.31% was obtained for the weight loss and gasometrictechniques respectively. The plots of log(wi - & #916;w) against time gave linear graph whichconfirms a first order reaction mechanism.

【 授权许可】

Unknown